Balanced slide-valve



(No Model.)

H. H. BEACH. Balanced Slide Valve;

No 242,865. Patented June 14,1881

UNITED STATES PATENT OFFICE.

HENRY H. BEACH, OF LITOHFIELD, ILLINOIS.

BALANCED SLIDE-VALVE.

SPECIFICATION forming part of Letters Patent No. 242,865, dated June 14,1881.

Application filed April 2, 1881. (No model.)

To all whom it may concern:

Be it known that I, HENRY H. BEACH, of Litchfield, in the county of Montgomery and State of Illinois, have invented a certain new and useful Improvement in Balanced Slide- Valves, of which the following is a full, clear, and exact description, reference being bad to the accompanying drawings, making part of this specification.

The pressure of the steam upon the valveseat is sustained by rollers working on the flanges of a Trail suspended from a piston occupying a cylindrical chamberin the top of the steam-chest. Brackets are attached to the top of the valve whose inturned flanges rest upon the rollers.

Figure 1 is a top view of a locomotive steamrhest with one-half of the top removed. Fig. 2 is a side view of the valve and piston with the chest in vertical section at a, Fig.1. Fig. 3 is a section of the val ve-chest and valve proper on line as m, Fig. 1, with the piston and hanger-rail in side view. Fig. 4 is a vertical section at a7 m, Fig. 1. Fig. is a bottom view of the hangenrail, showing its end bearings against the top portion of the steam-chest.

A is the valve-seatof an engine-cylinder, havin g the usual valve-ports, a a being the steamports, and a the exhaust-port.

B is a D-valve of ordinary construction, working on the seat-A.

O is the valvestem, which may be secured to the valve in any suitable manner. 7 the stem as passing through a slot, b, in the valve, with nuts 0 bearing against the ends of the valve.

To the top of the valve are attached brackets D, having inturned flanges d, that run upon rollers E to support the valve and prevent an excess of friction upon the seat above what is required to make the valve steam-tight. The rollers E roll upon theflanges f of aT-formed hanger-rail, F, supported by a piston, Gr, fitting a cylindrical cavity, H, in the topI of the steam-chest. The lower part J of the steamchest is attached directly to the cylinder A, and has a stuffing-box, j, for the valve-stem,

I show as usual. The rollers E are connected together in couples (see dotted lines, Fig. 5) by gudgeon-pins that work in slots f in the vertical web of the hanger-rail F. As the valve B works the rollers E roll backward and forward upon the flanges f. The slots f are made of suflicient length to allow the rollers all the play demanded by the movement of the valve. The ends f 2 of the hanger-rail F are curved con cen trical1y,an d have bearin gagainst concave projections 41 of the inner side of the steam-chest top I. These end bearings prevent endwise movement of the hanger-rail which might be otherwise induced by the movement of the valve.

Thepiston G has ring or other suitable packing to render it steam-tight'in the cylindrical cavity H. The cylinder-head Hhas an orifice, h, to allow the entrance of air and the escape of any s eam that might find passage around the piston.

i My improvement is readily applied to an ordin ary valve and steam-chest by removing the top of the steamchest and substituting a top, I, with a cylindrical cavity, H, a piston, Gr, with hanger-rail F and rollers E, and screwing the brackets D upon the top of the valve.

I prefer to make the brackets D, hanger F, and the rollers E of cast-steel.

I claim as my invention- 1. The combination of flanges on the valvebearing on wheels or rollers running on a hanger-rail attached to a piston or plunger working in a cavity of the steam-chest top, the rail being provided with end bearings in the steam-chest to prevent its vibration in the direction of the movement of the valve.

2. The combination of the valve 113, flanges cl, rail F, piston G, and steam-chest with the rollers E, connected in pairs by shafts passing through slots f in the vertical web of the hanger-rail F.

J. B. W. AMSDEN, DAVID DAVIS. 

